JPH0242562Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention is based on the invention, for example, when articles to be packaged, such as folded newspaper bundles, are fed into a packaging machine in a stacked form, and when the newspaper bundles are temporarily stopped and then re-advanced. This invention relates to a device that prevents cargo from collapsing.

(Prior Art) Conventionally, when wrapping objects, such as folded bundles of newspapers, in a laminated film, the objects are temporarily stopped against a stopper on an input conveyor in front of the film spreading screen, and then separated. After the positional deviation is corrected by an appropriate alignment device, etc., the feeding conveyor is driven again, and the film is advanced toward the film spreading screen, and the rear part is sealed, cut, and sealed, and the film is packaged.

(Problem to be solved by the invention) When an input conveyor loaded with folded newspaper bundles or other wrapped items is redriven to advance toward the film spreading screen, the upper newspaper bundle may slide backwards due to inertia during re-driving. This caused the cargo to collapse, making it impossible to package it properly (see Figure 2).

(Means for solving the problem) A first detector for detecting the intrusion of a packaged object into a predetermined position on the input conveyor and a retractable object stopper are provided, and the first cylinder provided at the fixed part A long lever that can be horizontally swung in the direction of travel of the packages is provided above the input conveyor, and an arm that can move up and down from above the input conveyor is attached to the tip of the lever by means of a second cylinder provided at an appropriate position on the lever. A second detector is also provided for detecting the completion of the downward movement of the arm, and the first detector transmits a signal to stop the input conveyor and operate the second cylinder following the advance operation of the stopper. The detector activates the first cylinder by transmitting a signal so that the arm presses the rear part of the object to be packaged. The extension of the cylinder prevents the packaged items from collapsing backward due to inertia.

(Function) As mentioned above, when the input conveyor is driven again, the expansion of the first cylinder, which presses the rear part of the packaged items by the arm, prevents the packaged items from collapsing backward due to inertia. Ru.

(Embodiment) To explain in detail the embodiment shown in the figure, 1 and 2 are intermittently driven separately by the input conveyor and the packaging conveyor.
A film curtain 3 extends vertically between the conveyors 1 and 2, and is composed of film rolls 4a, 4b, dancer rollers 5a, 5b, feed rollers 6a, 6b, etc. arranged above and below. 7a and 7b are a pair of upper and lower sealing/cutting/sealing devices disposed in front of the film spreading curtain 3; 8 is a pressing device disposed above the packaging conveyor 2; the film spreading curtain 3 is moved by the extension operation of the cylinder 8a; The packaged article P wrapped in a U-shape and stopped on the packaging conveyor 2 is compressed between the conveyor 2 and the seal
After sealing by the cut and seal devices 7a and 7b is completed, it seems to rise.

Reference numeral 9 denotes a first detector using a phototube arranged above the input conveyor 1; 10 denotes a stopper for packaged objects provided in front of the detector so as to be able to move forward and backward from the left and right sides; The input conveyor 1 is stopped and the stopper 10 is moved forward.

Reference numeral 11 denotes a beam appropriately installed above the input conveyor 1, and a long lever 13 that can be horizontally swung in the direction of movement of the packaged items P by means of a bracket 12 fixed to the lower surface.
is pivotally supported above the input conveyor 1, and the rod end of a first cylinder 15 supported by a bracket 14 hanging from the beam 11 is pivotally connected to a plate member 13a formed integrally with the lever 13. Further, the long lever 13 has a tip bent downward,
A second cylinder 1 has an L-shaped arm 17 pivotally connected to the bent lower end thereof via a shaft 16 so as to be able to swing vertically, and a rear end portion of which is pivotally connected to a member 13b hanging down from the lower surface of the plate member 13a.
The tip of the rod 8 is pivotally connected to the tip of the base protruding member 17a of the L-shaped arm 17, so that the second cylinder 18 is normally contracted and the L-shaped arm 17 is positioned above the input conveyor 1. Although it is possible for the package P to pass through, the L-shaped arm 17 expands due to the signal from the first detector 9, as shown by the solid line in FIG.
can be set as the downward movement position on the input conveyor 1.

19 is a short lever fixed to the shaft 16, and when the L-shaped arm 17 completes its downward movement, the long lever 1
3. Make the second detector 20 fixed at a proper location transmit a signal,
The transmission causes the first cylinder 15 to extend, and after a slight delay, the stopper 10 is retracted and the input conveyor 1 is driven again.

Note that the pushing force of the first cylinder 15 is such that when the input conveyor 1 starts driving again with the L-shaped arm 17 in contact with the rear end of the packaged item P, the upper part of the packaged item is left behind due to inertia. The force is set to be weak enough to allow the L-shaped arm 17 to follow the progress of the packaged object P without being moved.

Next, the effect will be explained. When the article to be packaged P enters a predetermined position by the input conveyor 1, the stopper 10 advances in response to a signal from the first detector 9, and when the conveyor 1 stops, the article to be packaged P is stopped against the stopper 10. Subsequently, the second cylinder 18 is extended and the L-shaped arm 17 is lowered onto the input conveyor 1 as shown by the first and third solid lines. When the lowering is completed, the second detector 20 sends a signal, and the first cylinder 15 is extended to push the long arm 13 forward, so that the L-shaped arm 17 is able to move the packaged object as shown by the two-dot chain line in FIG. It collides with the rear of object P and is held by a predetermined pressure. Subsequently, the stopper 10 moves to the retracted position by transmitting an appropriate delay signal such as a timer, and at the same time, the input conveyor 1 starts driving again. At this time, the rod extension operation of the first cylinder 15 continues for a certain distance from the start position, and as a result, the L-shaped arm 17 moves to follow the progress of the packaged object P, so the inertia generated at the start of re-driving is The rearward displacement of the upper part of the packaged object P is prevented, and even if the first cylinder 15 stops extending at an appropriate length, the packaged object P moves forward without causing the load to collapse.

After that, similarly to the known packaging means, from the time when the packaging conveyor 2 is driven in conjunction with the re-driving of the input conveyor 1 to advance the packaged items P to a predetermined position, the feed rollers 6a and 6b are activated to unpack the items. The film is fed out in synchronization with the moving speed of the object P, and the packaging conveyor 2 stops when it reaches below the pressing device 8, as shown by the two-dot chain line in FIG.

Subsequently, the pressing device 8 is activated, and the feed rollers 6a, 6 are activated.
The film clamping release and the operation of the sealing/cutting/sealing devices 7a and 7b in b are performed continuously, and the packaging of the packaged object P is completed.

On the other hand, when the aforementioned packaged item P is transferred from the input conveyor 1 to the packaging conveyor 2, the next packaged item P
is newly placed on the input conveyor 1, and the next packaged object P is also stopped at a predetermined position by the first detector 9 around the time when the packaging conveyor 2 is stopped. Of course, at this time, both the first cylinder 15 and the second cylinder 18 have returned to their original positions, so the L-shaped arm 1
7 has also returned to its original upward and backward position.

Therefore, the aforementioned cargo collapse prevention device can be sufficiently operated within the operating time of the pressing device 8, the feed rollers 6a, 6b, the seal/cut/seal devices 7a, 7b, etc. In addition, during the above explanation, the second
Before the cylinder 18 is extended, a separately provided alignment device (not shown) may be activated to correct the positional deviation of the packaged items P in the front and back and left and right directions. This can be carried out within the operating time of the pressing device 8 and the like.

(Effects of the invention) As described above, the present invention is equipped with a first detector for detecting the intrusion of a packaged object into a predetermined position on the input conveyor, a retractable object stopper, and a first detector provided on the fixed part. A long lever that can be horizontally swung in the direction of travel of the packaged items by a cylinder is provided above the input conveyor, and a second lever is provided at the tip of the lever at an appropriate position.
An arm is provided which can be moved up and down from above the input conveyor by a cylinder, and a second detector is provided to detect the completion of the downward movement of the arm,
A signal causes the first detector to stop the input conveyor and operate a second cylinder following the stopper advancing operation, and a second sensor causes the first cylinder to operate by a signal, thereby causing the arm to be covered. The rear part of the packaged items is pressed down to prevent the packaged items from collapsing backward due to inertia due to the extension of the first cylinder, which presses the rear part of the packaged items with an arm, when the input conveyor is driven again. As a result, there is no collapse of the load due to inertia at the start of re-transfer, and these operations to prevent collapse of the load can be performed within the time required for pressing, sealing, etc. on the packaging conveyor in the previous stage, which affects the overall packaging time. This makes it possible to create extremely beautiful packaging.

[Brief explanation of the drawing]

Fig. 1 is a side view of the overall arrangement showing one embodiment of the present invention, Fig. 2 is an explanatory view of the conventional one, Fig. 3 is an enlarged view taken in the direction of - arrow in Fig. 1, and Figs. It is a - and - arrow sectional view in a figure. In the figure, 1 and 2 are the input conveyor and the packaging conveyor, 3 is the film spreading curtain, and 7a and 7b are the seals and packaging conveyors.
A cut and seal device, 9 a first detector, 10 an object stopper, 13 a long lever, 15 a first
17 is an L-shaped arm, 18 is a second cylinder, 20 is a second detector, and P indicates an object to be packaged.

Claims (1)

[Scope of utility model registration request] At least an input conveyor, a film spreading curtain, a sealing device, and a packaging conveyor are sequentially arranged in parallel, and a first detector for detecting an intrusion of an object to be packaged into a predetermined position on the input conveyor, and an object to be packaged that can be freely retreated. A long lever equipped with a stopper and capable of horizontally swinging in the advancing direction of the packaged items by a first cylinder provided on a fixed part is provided above the feeding conveyor, and a second cylinder provided at the tip of the lever at an appropriate position allows the feeding to be carried out An arm movable up and down on the input conveyor from above the conveyor is provided, and a second detector is provided to detect the completion of the downward movement of the arm, and the first detector is activated by a signal to detect the input conveyor after the stopper advances. The second detector activates the first cylinder by transmitting a signal, so that the arm presses the rear part of the packaged items, and when the input conveyor is restarted, the packaged items are 1. A cargo collapse prevention device for a packaging machine, characterized in that the object to be packaged is prevented from collapsing rearward due to inertia by extension of a first cylinder that presses the rear part of the object with an arm.